H. Aras, and D. Huber. Intelligent Interactive Assistance and Mobile Multimedia Computing, volume 53 of Communications in Computer and Information Science, Springer Berlin Heidelberg, 10.1007/978-3-642-10263-9_3.(2009)
P. Persson, F. Espinoza, and E. Cacciatore. CHI '01: CHI '01 extended abstracts on Human factors in computing systems, page 43--44. New York, NY, USA, ACM, (2001)
P. Persson, F. Espinoza, P. Fagerberg, A. S, and R. Cöster. in Kristina Höök, David Benyon and Alan Munro (eds), Readings in Social Navigation of Information Space, page 151--173. Springer, (2002)
A. Neyem, S. Ochoa, and J. Pino. Groupware: Design, Implementation, and Use, volume 4715 of Lecture Notes in Computer Science, Springer Berlin / Heidelberg, 10.1007/978-3-540-74812-0_14.(2007)